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Measurement of Galaxy Cluster Integrated Comptonization and Mass Scaling Relations with the South Pole Telescope
Gladders, M. D.; Rest, A.; Foley, R. J. +67 more
We describe a method for measuring the integrated Comptonization (Y SZ) of clusters of galaxies from measurements of the Sunyaev-Zel'dovich (SZ) effect in multiple frequency bands and use this method to characterize a sample of galaxy clusters detected in the South Pole Telescope (SPT) data. We use a Markov Chain Monte Carlo method to f…
Ionospheric photoelectrons at Venus: Case studies and first observation in the tail
Coates, A. J.; Fedorov, A.; Barabash, S. +5 more
The presence of photoelectrons in ionospheres, including that of unmagnetised Venus, can be inferred from their characteristic spectral peaks in the electron energy spectrum. The electrons within the peaks are created by the photoionisation of neutrals in the upper atmosphere by the solar HeII 30.4 nm line. Here, we present some case studies of ph…
Power law inflation with a non-minimally coupled scalar field in light of Planck 2015 data: the exact versus slow roll results
Herrera, Ramón; del Campo, Sergio; Gonzalez, Carlos
We study the power law inflation in the context of non-minimally coupled to the scalar curvature. We analyze the inflationary solutions under an exact analysis and also in the slow roll approximations. In both solutions, we consider the recent data from Planck 2015 data to constraint the parameters in our model. In this framework, we find that in …
Characterization of the known T-type dwarfs towards the σ Orionis cluster
Béjar, V. J. S.; Zapatero Osorio, M. R.; Peña Ramírez, K.
Aims: The detailed study of T-type candidate members of the young σ Orionis cluster (~3 Myr, ~352 pc, solar metallicity) is fundamental to properly assess the objects' cluster membership and their contribution to the definition of the substellar mass function.
Methods: A total of three T-type candidates (S Ori 70, S Ori 73, and S Ori J05…
On the Binary Frequency of the Lowest Mass Members of the Pleiades with Hubble Space Telescope Wide Field Camera 3
Dupuy, Trent J.; Liu, Michael C.; Deacon, Niall R. +2 more
We present the results of a Hubble Space Telescope Wide Field Camera 3 (WFC3) imaging survey of 11 of the lowest mass brown dwarfs in the Pleiades known (25-40 MJup). These objects represent the predecessors to T dwarfs in the field. Using a semi-empirical binary point-spread function (PSF)-fitting technique, we are able to probe to 0.″…
Signatures of the very early Universe: Inflation, spatial curvature, and large scale anomalies
Aslanyan, Grigor; Easther, Richard
A short inflationary phase may not erase all traces of the primordial Universe. Associated observables include both spatial curvature and "anomalies" in the microwave background or large-scale structure. The present curvature ΩK ,0 reflects the initial curvature, ΩK ,start , and the angular size of anomalies depends on k…
Current sheets with inhomogeneous plasma temperature: Effects of polarization electric field and 2D solutions
Artemyev, A. V.; Vasko, I. Y.; Zimbardo, G. +1 more
We develop current sheet models which allow to regulate the level of plasma temperature and density inhomogeneities across the sheet. These models generalize the classical Harris model via including two current-carrying plasma populations with different temperature and the background plasma not contributing to the current density. The parameters o…
Search for horizontal and vertical variations of CO in the day and night side lower mesosphere of Venus from CSHELL/IRTF 4.53 µm observations
Bertaux, Jean-Loup; Lellouch, Emmanuel; Marcq, Emmanuel +3 more
High-resolution (R ~ 43 , 000) spectroscopic observations of both day and night sides of Venus were acquired using CSHELL at IRTF between 2202 and 2207cm-1 (4.53- 4.54 µm) during the latest maximal eastern and western elongations of Venus in two four-nights observing runs in August 2012 and November 2013. Their purpose was to inve…
The variability behaviour of CoRoT M-giant stars⋆
Baglin, A.; Paz-Chinchón, F.; Janot-Pacheco, E. +8 more
Context. For six years the Convection, Rotation, and planetary Transits (CoRoT) space mission has been acquiring photometric data from more than 100 000 point sources towards and directly opposite the inner and outer regions of the Galaxy. The high temporal resolution of the CoRoT data, combined with the wide time span of the observations, enabled…
Subaru and Swift observations of V652 Herculis: resolving the photospheric pulsation
Starling, R. L. C.; Jeffery, C. S.; McCormac, J. +4 more
High-resolution spectroscopy with the Subaru High Dispersion Spectrograph, and Swift ultraviolet photometry are presented for the pulsating extreme helium star V652 Her. Swift provides the best relative ultraviolet photometry obtained to date, but shows no direct evidence for a shock at ultraviolet or X-ray wavelengths. Subaru has provided high sp…